The electronic configuration of an element is 1s ²2s₂2p₆3s ₂
3p₃. Where is the element located in the periodic table?

A. Group lll, period 3

B. Group lll, period 5

C. Group V, period 3

D. Group V, period 5

Group O of elements are unreactive because

A. their outmost shells contain equal number of electrons

B. their highest occupied enegy level is full

C. they are monatomic gases

D. they are non-metals

An element X with electronic configuration 1s₂2s₂2p ₆3s ₂3p₅combines with another element Y with the configuration 1s2s₂2p₂3s₃3p₅. What is the formula of the compound formed?

A. X₂Y₅

B. X₂Y₃

C. XY₃

D. XY₂

Which of the following statements about dative bonding is not correct?

A. there is sharing of electrons

B. one atom must possess a lone pair electrons

C. each participating atom contributes one electron

D. it can be formed between molecules

Which of the following quantities is the same for one mole of Br_2(l) and one mole of He_(g)?

A. Number of molecules

B. Number of atoms

C. Total mass of the particles

D. Volume occupied at s.t.p

Which of the following acids is dibasic?

A. Hydrochloric acid

B. Trioxosulphate (IV) acid

C. Dioxonitrate (lll) acid

D. Ethanoic acid

Bees inject an acidic substance when they sting. Which of the following chemical could be used to treat bee stings?

A. CH₃COOH

B. NaHCO₃

C. C₂H₅OH

D. H₂O₂

Which of the following salts can be prepared by reacting the metal with dilute H₂SO₄?

A. CuSO₄

B. MgSO₄

C. BaSO₄

D. PbSO₄